Place trout fillets onto parchment paper lined baking sheet. Sprinkle evenly with garlic, thyme and pepper.
Using serrated knife, cut both ends off grapefruit. Using sawing motion, cut skin and white pith off and discard. Cut grapefruit between membranes into segments into large bowl. Squeeze remaining membrane of grapefruit over trout fillets.
Place trout in 220° C (425°F) oven for 10 minutes or until fish flakes easily with fork.
Meanwhile, in saucepan of boiling water, cook green beans for about 7 minutes or until tender crisp. Drain and add to grapefruit segments. Serve with trout.
*Grapefruit and grapefruit juice can interact with certain medications. Speak to your healthcare provider if you have concerns.